Comparison

WinDat Opener vs Device Tester Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

WinDat Opener

Easily open and extract attachments from winmail.dat email files. This utility integrates with your device's file manager and cloud storage, allowing you to preview or open embedded documents and images with other applications.

Highlights
  • Decodes all winmail.dat files
  • iOS 17 and iPadOS 17 support
  • Drag-and-drop support on iPads
  • File manager integration (iCloud, Dropbox)
  • Extracts and previews embedded attachments
  • Supports various document and image formats
Features
Read full description

· Decodes all winmail.dat files · iOS 17 and iPadOS 17 support · Full support for drag-and-drop on iPads · File manager integration; WinDat Opener will open and save files to and from any location that file manger supported, e.g., iCloud and DropBox WinDat Opener opens the "winmail.dat" email attachments that are sometimes sent by Outlook and Outlook Express email clients. These files are in “TNEF” format, and usually contain attachments such as spreadsheets or presentations embedded within them. WinDat Opener extracts the embedded attachments hidden inside the winmail.dat file, allowing you to preview then right in WinDat Opener, or open them with another application, e.g., Pages. WinDat Opener is simple to use - it integrates transparently with Mail on the iPhone, iPod Touch or iPad at operating system level, and has it's own integrated file manager that gives you access to locations on your device, and cloud storage provides such as DropBox and iCloud. Once WinMail Opener is installed, all you have to do is to touch any winmail.dat file, and the app you're using will offer to send it to WinMail Opener for the embedded attachments to be extracted. You can then view the extracted files using Winmail Opener’s built-in file viewer, which supports a wide variety of document formats including doc, docx, xls, xlsx, ppt, pptx and PDF, as well as most image formats such as JPEG and TIFF. If you have an application installed on your device that can edit or view an extracted file, e.g., Pages for doc files, you can open any extracted file in that application. WinDat Opener also offers the option of emailing the extracted files, right from within WinDat Opener. WinDat Opener is a universal application. It will work on the iPhone, iPod Touch or iPad, in any orientation. WinDat Opener works on any version of iOS from 11 onward.

About

Device Tester Pro

Monitor your device's core system components. Track memory, disk, CPU, network, and battery usage. Gain insights into your system's performance and health.

Highlights
  • Check RAM usage
  • Monitor disk usage
  • Track CPU usage
  • View network activity
  • Analyze battery status
  • System information overview
Features
Read full description

Device Tester Pro: A simple tool for hardware testing with lightweight diagnostic checks for key components. Key Features: • Hardware Test: → Test Camera, Bluetooth, Audio, Microphone, Keyboard Input, Sensors, and other hardware components. • System Info Tools: → View quick device details including RAM, CPU, storage, network, and battery status. • Utilities: → QR Code Generator: Create QR codes instantly from text or data. → Random Selection Tool: Make quick random choices or selections. → Clipboard Cleaner: Clear clipboard content with one tap. → Torch: Quickly turn on/off the flashlight and adjust brightness levels.

Screenshots

WinDat Opener1 screens
Device Tester Pro4 screens

Verdict

The call

The clearest difference is rating: Device Tester Pro at 4.1 against WinDat Opener's 2.3. Device Tester Pro also leads on update cadence (fortnightly vs every 5 months) and ratings volume (474 vs 3). WinDat Opener's advantage is iOS requirement (12.0 vs 16.0). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

WinDat Opener costs $5.99 and Device Tester Pro $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Device Tester Pro holds the better App Store score, 4.1 against 2.3. That said, the two scores are not equally well evidenced: Device Tester Pro has 474 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 63% of WinDat Opener's written reviews are positive against 64% of Device Tester Pro's.

UpkeepUpdate frequency

WinDat Opener ships an update every 5 months, Device Tester Pro fortnightly. Both last shipped on October 24, 2026.

Scorecard6 real differences · 4 level
WinDat Opener versus Device Tester Pro: the parameters behind the verdict, then further details
ParameterWinDat OpenerDevice Tester Pro
Price$5.99$1.99 — better
Rating2.3 (3 ratings)4.1 (474 ratings) — better
Positive reviews62.5% of reviews64.2% of reviews — better
Number of ratings3474 — better
Update frequencyEvery 5 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size2 MB7 MB
Age rating4+4+
DeveloperAlexander McGuffogPhan Nhut

Customer experience

WinDat Opener

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews24 reviews
Positive62.5%
Neutral4.2%
Negative33.3%

Device Tester Pro

All ratings467 ratings
Positive79.0%
Neutral5.6%
Negative15.4%
Written reviews243 reviews
Positive64.2%
Neutral6.2%
Negative29.6%

Bugs and requests

WinDat Opener

Not enough reviews yet to summarise bugs or requests.

Device Tester Pro

Reported bugs

3 issues
  • Scan function doesn't complete
  • Processes list always shows zero
  • Crashes on iPhone 15 Pro Max

Requested features

3 requests
  • Automatic memory cleaning
  • Detailed process information
  • Compatibility with newer iOS versions

In-app purchases

None

WinDat Opener

No in-app purchases

None

Device Tester Pro

No in-app purchases

Questions

Is WinDat Opener free?
WinDat Opener costs $5.99, with no in-app purchases.
Is Device Tester Pro free?
Device Tester Pro costs $1.99, with no in-app purchases.
Which has better reviews, WinDat Opener or Device Tester Pro?
Device Tester Pro is rated higher. WinDat Opener averages 2.3 out of 5 from 3 ratings, while Device Tester Pro averages 4.1 from 474 ratings.
Do WinDat Opener or Device Tester Pro have ads?
Neither WinDat Opener nor Device Tester Pro shows ads.
Which is updated more often, WinDat Opener or Device Tester Pro?
WinDat Opener ships an update every 5 months, and Device Tester Pro fortnightly. Most recently, WinDat Opener was updated on October 24, 2026 and Device Tester Pro on October 24, 2026.

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